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It\u2019s the beat that drives the bugaloo and mambo. Ayana Contreras travels to Cuba to understand the clave.

Plus, we go beneath a motorway flyover in Rio de Janeiro, where US hip-hop from the 1990s gets re-imagined every Saturday night; we meet a 9-year-old boy who is preserving his family\u2019s Cambodian history through dance; South African superstar Johnny Clegg tells us how he helped form an interracial dance troupe during apartheid; and we remember Johnny Hallyday, \u201cthe French Elvis Presley\u201d.

(Image: Dancers at the weekly Saturday night charme dance in Madureira, a neighborhood in Rio de Janeiro's North Zone. Credit: Catherine Osborn)